Question

我们可以只通过范围键删除dynamo db中的多条记录吗？

我正在尝试像这样的sql语句

{ "type": "is array", "count": 30, "summary": [ { "DATE": "2017-08-01" }, { "DATE": "2017-08-02" }, { "DATE": "2017-08-03" }, { "DATE": "2017-08-04" }, { "DATE": "2017-08-05" }, { "DATE": "2017-08-06" }, { "DATE": "2017-08-07" }, { "DATE": "2017-08-08" }, { "DATE": "2017-08-09" }, { "DATE": "2017-08-10" }, { "DATE": "2017-08-11" }, { "DATE": "2017-08-12" }, { "DATE": "2017-08-13" }, { "DATE": "2017-08-14" }, { "DATE": "2017-08-15" }, { "DATE": "2017-08-16" }, { "DATE": "2017-08-17" }, { "DATE": "2017-08-18" }, { "DATE": "2017-08-19" }, { "DATE": "2017-08-20" }, { "DATE": "2017-08-21" }, { "DATE": "2017-08-22" }, { "DATE": "2017-08-23" }, { "DATE": "2017-08-24" }, { "DATE": "2017-08-25" }, { "DATE": "2017-08-26" }, { "DATE": "2017-08-27" }, { "DATE": "2017-08-28" }, { "DATE": "2017-08-29" }, { "DATE": "2017-08-30" } ] }

所以这里员工姓名delete from employee where employee_name='gopal';的记录应该被删除

我们可以在dynamo db中实现这样的sql查询吗？

Answer 1

您必须执行BatchWriteItem才能删除项目。 From the documentation：

BatchWriteItem执行put和delete

Answer 2

基于API，DynamoDB没有批量删除。

http://docs.aws.amazon.com/AWSJavaScriptSDK/latest/AWS/DynamoDB.html

您需要查询该项目并使用其分区键删除。

我建议看看ODM，

https://github.com/clarkie/dynogels

使操作更简单。

查看要删除的样本调用

Pulse()

Answer 3

@Kannaiyan感谢您的评论......

我找到了带有java http://docs.aws.amazon.com/amazondynamodb/latest/developerguide/JavaDocumentAPICRUDExample.html

的dynamoDB的解决方案

DeleteItemSpec deleteItemSpec = new DeleteItemSpec().withPrimaryKey("Id", 120)
                .withConditionExpression("#ip = :val").withNameMap(new NameMap().with("#ip", "InPublication"))
                .**withValueMap(new ValueMap()**.withBoolean(":val", false)).withReturnValues(ReturnValue.ALL_OLD);

使用键，值对获取记录并将其存储在＆＃34; withValueMap（new ValueMap（）＆＃34;这有助于我。

感谢。

Answer 4

请选中此查询，它正在处理多个数据

const params = {TableName: "test"};

docClient.scan(params, (error, result) => {
        if (error) { console.log(error,"error scan"); }

        result.Items.forEach(function(item) {          
            docClient.delete({Key:{mainID: item.id},TableName:"test"}, (error) => {
                if (error) {
                    console.log("Delete fail");
                }
                console.log("Delete  Success");
            });
        });

});

Answer 5

希望这可能有所帮助：

import boto.dynamodb
import boto.dynamodb.condition as condition

修改以下值以设置您的AWS区域和访问密钥：
将此设置为AWS区域，例如＆＃39; us-west-2＆＃39;，＆＃39; us-east-1＆＃39;等

REGION = 'us-east-1'

复制下面的AWS访问密钥值：

AWS_ACCESS_KEY = 'your_access_key'

复制下面的AWS秘密访问密钥值：

AWS_SECRET_ACCESS_KEY = 'your_secret_access_key'

在下面设置AWS云温度计表的名称：

TABLE_NAME = 'Temperatures'

设置为要删除的Id值的名称。具有此ID的所有行都将被删除！

ID_TO_DELETE = 'id_value_to_delete'

连接到桌面。 `

conn = boto.dynamodb.connect_to_region(REGION,` aws_access_key_id=AWS_ACCESS_KEY, aws_secret_access_key=AWS_SECRET_ACCESS_KEY)
temperatures = conn.get_table(TABLE_NAME)

打印警告

print 'About to delete all rows with Id {0} from table {1} in {2}.'.format(ID_TO_DELETE, TABLE_NAME, REGION)
print 'Are you sure? (y/n)'
response = raw_input().upper()
if response != 'Y' and response != 'YES':
    print 'OK, not deleting anything!'
    quit()

扫描表格并删除与提供的ID匹配的所有项目

print 'Deleting rows...'
count = 0

for row in temperatures.scan(scan_filter={'Id': condition.EQ(ID_TO_DELETE)}):
    count += 1
    row.delete()

打印＆＃39;已删除{0}行。＆＃39; .format（count）

删除dynamo db中的多个记录

5 个答案: